* h8300.c (shift_alg_hi): Various tweaks to improve performance

        of HImode shifts.
        (get_shift_alg): Corresponding changes.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@56665 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 32 insertions, 10 deletions

diff --git a/gcc/config/h8300/h8300.c b/gcc/config/h8300/h8300.c
index 841c8b7a641..19520db4333 100644
--- a/gcc/config/h8300/h8300.c
+++ b/gcc/config/h8300/h8300.c
@@ -2213,23 +2213,23 @@ static const enum shift_alg shift_alg_hi[3][3][16] = {
     /* TARGET_H8300  */
     /*  0    1    2    3    4    5    6    7  */
     /*  8    9   10   11   12   13   14   15  */
+    { INL, INL, INL, INL, INL, INL, INL, SPC,
+      SPC, SPC, SPC, SPC, SPC, SPC, SPC, SPC }, /* SHIFT_ASHIFT   */
     { INL, INL, INL, INL, INL, LOP, LOP, SPC,
-      SPC, SPC, SPC, SPC, SPC, LOP, LOP, SPC }, /* SHIFT_ASHIFT   */
+      SPC, SPC, SPC, SPC, SPC, SPC, SPC, SPC }, /* SHIFT_LSHIFTRT */
     { INL, INL, INL, INL, INL, LOP, LOP, SPC,
-      SPC, SPC, SPC, SPC, SPC, LOP, LOP, SPC }, /* SHIFT_LSHIFTRT */
-    { INL, INL, INL, INL, INL, LOP, LOP, SPC,
-      SPC, SPC, SPC, SPC, SPC, LOP, LOP, SPC }, /* SHIFT_ASHIFTRT */
+      SPC, SPC, SPC, SPC, SPC, SPC, SPC, SPC }, /* SHIFT_ASHIFTRT */
   },
   {
     /* TARGET_H8300H  */
     /*  0    1    2    3    4    5    6    7  */
     /*  8    9   10   11   12   13   14   15  */
-    { INL, INL, INL, INL, INL, LOP, LOP, SPC,
+    { INL, INL, INL, INL, INL, INL, INL, SPC,
       SPC, SPC, SPC, SPC, SPC, ROT, ROT, ROT }, /* SHIFT_ASHIFT   */
-    { INL, INL, INL, INL, INL, LOP, LOP, SPC,
+    { INL, INL, INL, INL, INL, INL, INL, SPC,
       SPC, SPC, SPC, SPC, SPC, ROT, ROT, ROT }, /* SHIFT_LSHIFTRT */
-    { INL, INL, INL, INL, INL, LOP, LOP, SPC,
-      SPC, SPC, SPC, SPC, SPC, LOP, LOP, SPC }, /* SHIFT_ASHIFTRT */
+    { INL, INL, INL, INL, INL, INL, INL, SPC,
+      SPC, SPC, SPC, SPC, SPC, SPC, SPC, SPC }, /* SHIFT_ASHIFTRT */
   },
   {
     /* TARGET_H8300S  */
@@ -2240,7 +2240,7 @@ static const enum shift_alg shift_alg_hi[3][3][16] = {
     { INL, INL, INL, INL, INL, INL, INL, INL,
       SPC, SPC, SPC, SPC, SPC, ROT, ROT, ROT }, /* SHIFT_LSHIFTRT */
     { INL, INL, INL, INL, INL, INL, INL, INL,
-      SPC, SPC, SPC, SPC, SPC, LOP, LOP, SPC }, /* SHIFT_ASHIFTRT */
+      SPC, SPC, SPC, SPC, SPC, SPC, SPC, SPC }, /* SHIFT_ASHIFTRT */
   }
 };
 
@@ -2458,7 +2458,7 @@ get_shift_alg (shift_type, shift_mode, count, info)
 	      goto end;
 	    }
 	}
-      else if (8 <= count && count <= 12)
+      else if (8 <= count && count <= 13)
 	{
 	  info->remainder = count - 8;
 
@@ -2484,6 +2484,28 @@ get_shift_alg (shift_type, shift_mode, count, info)
 	      goto end;
 	    }
 	}
+      else if (count == 14)
+	{
+	  switch (shift_type)
+	    {
+	    case SHIFT_ASHIFT:
+	      if (TARGET_H8300)
+		info->special = "mov.b\t%s0,%t0\n\trotr.b\t%t0\n\trotr.b\t%t0\n\tand.b\t#0xC0,%t0\n\tsub.b\t%s0,%s0";
+	      goto end;
+	    case SHIFT_LSHIFTRT:
+	      if (TARGET_H8300)
+		info->special = "mov.b\t%t0,%s0\n\trotl.b\t%s0\n\trotl.b\t%s0\n\tand.b\t#3,%s0\n\tsub.b\t%t0,%t0";
+	      goto end;
+	    case SHIFT_ASHIFTRT:
+	      if (TARGET_H8300)
+		info->special = "mov.b\t%t0,%s0\n\tshll.b\t%s0\n\tsubx.b\t%t0,%t0\n\tshll.b\t%s0\n\tmov.b\t%t0,%s0\n\tbst.b\t#0,%s0";
+	      else if (TARGET_H8300H)
+		info->special = "shll.b\t%t0\n\tsubx.b\t%s0,%s0\n\tshll.b\t%t0\n\trotxl.b\t%s0\n\texts.w\t%T0";
+	      else /* TARGET_H8300S */
+		info->special = "mov.b\t%t0,%s0\n\texts.w\t%T0\n\tshar.w\t#2,%T0\n\tshar.w\t#2,%T0\n\tshar.w\t#2,%T0";
+	      goto end;
+	    }
+	}
       else if (count == 15)
 	{
 	  switch (shift_type)